While downloaded images from Leah's camera I came across these shots that I hadn't been aware that she had taken. These were taken during the Christmas games and are all of the one-legged high kick. Here is how it works.
The contestant stands on one foot. Jumping up he kicks a object suspended above his head a set distance from the ground with the same foot he launched himself with. He then lands, again landing on the same foot. The object is raised after each round, miss in all three attempts at a height and you're eliminated. The game goes on until only one contestant succeeds at a height.
Note that in the photos, the stand has been placed on a chair because they couldn't get it high enough.